Superconducting properties of RbOs2O6 analyzed within Eliashberg theory
S. Manalo, H. Michor, G. Hilscher, M. Brühwiler, B. Batlogg
DOI 10.1103/PhysRevB.73.224520 · Physical Review B
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Abstract
Thermodynamic properties such as the specific-heat difference between superconducting and normal states Cs−Cn, the thermodynamic critical field Hc(T), and the upper critical field Hc2(T) of the β-pyrochlore superconductor RbOs2O6 are analyzed within the framework of s-wave Eliashberg theory including anisotropy and scattering effects, yielding a small electron-phonon coupling anisotropy parameter of about ⟨ak2⟩≃0.005, and a Fermi velocity anisotropy parameter ⟨bk2⟩≃0.3–0.35. Agreement between theory and experiment is achieved for these parameters, the Sommerfeld coefficient γ, and a model spectral function α2F(ω) consisting of two Einstein peaks and a Debye contribution. A renormalization of the Fermi velocity by an enhancement factor due to electron-electron correlations λee≃1 is considered in the analysis of the experimental Hc2(T) data.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.4 | Pressure not reported | unknown |
| RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.37 | Pressure not reported | unknown |
| Cd2Re2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
| KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.6 | Pressure not reported | unknown |
| CsOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.3 | Pressure not reported | unknown |
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